She continued: "We tried to tell the school he was going to do it last week but they just kept saying they would phone back. He wanted to dye his hair pink as soon as possible because Kallum is having a bone marrow transplant on Monday.

"The little lad is popular and has 30 visitors a day at hospital and Daniel has also been to see him. Everyone is doing their hair to show their support for him so it is a shame the school couldn't see sense."

Kallum's mum Jamie Aish, 36, has also backed Daniel and said her son's cousin Kasey Harper, 15, has been allowed to go pink by Plantsbrook School in Sutton Coldfield.

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Kallum's mum Jamie comforts her son in hospital

She added: "I thought they went to school to use their brains not their hair.

"It seems schools are quite prepared to drop their dress codes for St Patrick's Day or Children in Need but not for this."

Kallum, who lives in Kingstanding, Birmingham, was rushed to Birmingham Children's Hospital last Wednesday where he will stay for six weeks.

His 11-year-old brother Christian is bravely donating his own bone marrow on Monday in a bid to cure the youngster.

Kallum was diagnosed with aplastic anaemia, a condition which only affects 150 people each year in Britain, in January.

The rare disease is not a type of cancer but is treated with some of the same therapies including chemotherapy drugs and bone marrow transplantation.

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Kallum Aish pictured in hospital with his friends

Jamie added: "He started to go discoloured but I thought it was down to the winter.

"Then he started to get blood blisters under his skin. For me that was the signal something was wrong.

"His brothers have been so supportive. Each one had the test to see if they were a (bone marrow) match.

"Kallum's doing okay but he's very tired."

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Fairfax School says "charity is close to its heart"

Fairfax School claimed they were only given one day's notice of Daniel's hair colour which breaches behavioural policy, and said his parents were warned of the consequences.

Acting Head of Academy Chris Stevens said the school had a history of supporting charitable causes but they had to be pre-planned and orchestrated.

He added: "This was a last minute request that had not been organised.